This bubble chart visualizes the correlation between average horsepower and torque for various car makes, with bubble size representing highway MPG and color distinguishing makes. The D3 v7 code loads data from a CSV, uses `d3.scaleLinear` for axes and bubble sizing, and `d3.scaleOrdinal` with `d3.interpolateTurbo` for color mapping. Interactive tooltips appear on mouseover, and an SVG legend explains bubble size and color categories.